chore: support min version of go: 1.14

[thinkerou]

No description provided.

[codecov]

Codecov Report

Merging #2964 (36eb7a7) into master (a06d546) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #2964   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files          41       41           
  Lines        3085     3085           
=======================================
  Hits         3041     3041           
  Misses         31       31           
  Partials       13       13           

Flag	Coverage Δ
go-1.13	?
go-1.14	∅ <ø> (∅)
go-1.15	∅ <ø> (∅)
go-1.16	98.57% <0.00%> (ø)
go-1.17	98.47% <0.00%> (ø)
macos-latest	98.57% <0.00%> (ø)
nomsgpack	98.55% <0.00%> (ø)
ubuntu-latest	98.57% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
debug.go	91.66% <0.00%> (ø)

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[thinkerou]

@appleboy please review the pr, thanks!